How to use window.onload in JavaScript

Question

Whenever I use window.onload it acts really weird

--It don't work when I use a function inside it but sometimes it do work atleast in other people's code
What's the right way to use it ?

Answer 1

window.onload = func; <-- correct
window.onload = function(){func();}; <-- correct
window.onload = func(); <-- wrong